Phosphor Lab Report

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Effect of Heating Rate on Thermoluminescence Glow Curves of Rare Earth Doped Y2O3 Phosphor Tarkeshwari Verma1 ,Sadhana Agrawal1 1 Department of Physics, National Institute of Technology Raipur, Raipur-492010, India 09993885860, Abstract The present paper reports effect of heating rate on thermoluminescence glow curves of rare earth doped y2o3 phosphor. Solid state reaction method was used for synthesis of phosphor. Crystallite size and structure of phosphors were characterized by XRD and morphology by SEM and FTIR. The crystallite size is found to be 143nm. TL glow curves show, the shifting of the peaks towards the higher…show more content…
Figure 2: FTIR spectra of Y2O3:Sm +3 doped phosphor. 2.3 Scanning electron microscope (SEM) Fig. 3 shows SEM images of prepared phosphors for different resolutions. As this figures shows, the grain size of Y2O3: Sm3+ to be in the range of few microns around 200 nm.The photographs of the samples show near spherical morphology and uniform agglomeration of the sample. Figur3 : SEM images of Y2O3:Sm +3 (0.5mol %) with different resolution 3 Luminescence property 3.1Thermo luminescence study of Y2O3:Sm +3:-TL is one of the possible ways to estimate the trap states of the material. The afterglow of any phosphor is generated by the detrapped carriers that recombine with the opposite carrier in the luminescent center with a transition resulting in visible region. Y2O3:Sm +3 doped with Sm +3 with concentration ratio 0.5 to 2mol%, respectively, was used to undertake the TL measurements because we observed maximum TL signal strength at this ratio. 0 50 100 150 200 250 300 -50 0 50 100 150 200 250 300 350

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